I wouldn't advise it. If the edges don't come loose, there's no way that the middle can be a problem, so doing the edges is enough and there's no harm in not doing the middle.

On the other hand, doing the middle is quite difficult to do without inducing bubbles, so there is strong potential of causing harm if you do the middle.

It's all just appearance stuff, but if you didn't care about appearance you wouldn't have wanted to do this in the first place, so I'd advise minimizing the risk by not heating the middle.

(BTW, what I reported on solvents is first-hand experience... the different brands behaved differently for me when applied to monokote in about 1999 or 2000. The various brands use proprietary mixtures of ketones and other aromatics and they may have the same ingredients and concentrations or they may not -- and they may be the same today as when I tried them or they may not. I assume that you've used both, Minn, and I'm glad they both worked well for you, but be advised, they don't always and we'd have to do more investigation to know when they do and do not, so we can't make a blanket claim that they're the same.)